The current high-precision air pressure sensor generally uses a MEMS technology to process a vacuum chamber and a Wheatstone bridge on a single crystal silicon wafer. The output voltage across the bridge arm of the Wheatstone bridge is proportional to the applied pressure and is temperature compensated. And after calibration, it has the characteristics of small volume, high precision, fast response and no influence on temperature changes. The output mode is generally analog voltage output and digital signal output. Among them, the digital signal output mode is convenient for the connection with the single chip microcomputer, and is the mainstream in the market.
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The air pressure sensor is mainly used to measure the pressure of the gas. One atmospheric pressure range pressure sensor is usually used to measure the change of the weather and the correlation between the air pressure and the altitude for the altitude measurement.
Although the air pressure sensor is rarely seen on current GPS receivers, the high-precision air pressure sensor GPS receiver can be widely used.
Altitude measurement
At present, due to technical and other factors, the altitude error calculated by the GPS receiver is about several tens of meters, so that the general GPS receiver does not display the altitude data. If you want to measure the altitude value more accurately, you need to measure it in other ways. One way is to add a barometric sensor to the GPS receiver and calculate the actual altitude of the GPS receiver using the correspondence between barometric pressure and altitude.
The current two application directions:
1. Handheld GPS receiver
Users of handheld GPS receivers are generally young people who like to travel, climb, and explore the wild. They need to know the latitude, longitude, direction and height. When they are in the woods or under the cliff, they may not receive GPS satellite signals. Therefore, some models of handheld GPS receivers are equipped with electronic compass and barometric altimeter, such as GARMIN. VISTA, Magellan Explorer 600, etc. Due to the high cost of high-precision magnetoresistive sensors and air pressure sensors, the cost of handheld GPS receivers has not been reduced, which limits the size of the market. Now with the advent of low-cost, high-precision air pressure sensors, this segment of the market is believed to have a relatively large growth.
2. Car GPS receiver
Nowadays, with the continuous lowering of prices, more and more people have purchased car GPS receivers. While enjoying the convenience brought by GPS navigation, they often hear people complain that GPS often makes mistakes when driving on overpasses and elevated roads. Navigation instructions. For example, when driving normally on the bridge, the GPS suddenly calls you to turn right, but there is no right-turning exit on the bridge. This is because the GPS receiver does not accurately determine whether the vehicle is actually on the bridge or under the bridge, thus issuing an error. Instructions. As mentioned above, the height data error calculated by the GPS receiver through satellite signals is usually several tens of meters. However, the height difference between the upper and lower layers of the general overpass and the elevated road is usually in the range of several meters to ten meters, so it is not on the navigation map. Considering the height data, the three-dimensional overpass can be directly treated as a two-dimensional intersection, and the horizontal positioning error of the GPS receiver often leads to the error under the bridge. Incorrect navigation instructions not only cause inconvenience to the customer, but it can be dangerous if the customer operates completely in accordance with the navigation instructions, but this problem has not been well solved before.
If we add a high-precision air pressure sensor to the car GPS receiver to assist in the measurement of altitude data, this problem can be solved very well. Now the high-precision air pressure sensor is used to measure the height and can achieve a resolution of 1 meter. It is completely competent to judge the height difference between the bridge and the bridge. Of course, to solve this problem, we need the cooperation of GPS map dealers to measure the 3D data of the plane and height of the overpass and elevated roads, and make a 3D model of the overpass and elevated roads, so that the navigation software can use the height data measured by the barometric altimeter to guide the driver at the overpass. Drive right on the elevated road.
The cost of adding a high-precision air pressure sensor to a GPS receiver is about two dollars. This cost is worth paying for compared with the benefits. It is believed that it will take a long time for the high-precision air pressure sensor to become a GPS receiver. Standard configuration, who is the first to start, who can preempt the market.
Portable weather station
Adding a high-precision air pressure sensor, a humidity sensor, and a temperature sensor to the GPS receiver becomes a portable weather station, which can be either hand-held or vehicle-mounted. It can measure air temperature, air humidity, atmospheric pressure, altitude, and predict changes in weather/yin/rain over the next 12 hours based on changes in atmospheric pressure.
At present, the specialized household weather station is dedicated to export to foreign markets such as Europe and the United States, and the monthly export volume is over 1 million units. Compared to specialized home weather stations, GPS receivers with portable weather station capabilities have three advantages:
Cost advantage
Only three sensors are added to the hardware. The best sensor cost is only $6 to $7. Others such as power supplies, MCUs, displays, and enclosures are all available. There is no additional cost.
2. Performance advantages
The battery used by the GPS receiver is generally a lithium battery, which has a longer working time; the MCU has more powerful performance and can support multimedia functions; the storage space is larger, and the historical data of weather changes for several years can be stored; the display is a high-resolution LCD display. The screen is more delicate and beautiful.
3. Positioning is more accurate
The handheld GPS receiver is aimed at those who love outdoor sports. The car GPS receiver is aimed at home users who own the car, which coincides with the customer base of the home weather station.
Although there is currently no model of GPS receivers that actually increase the functionality of portable weather stations, but there are three advantages, I believe that there will be companies optimistic about this prospect, the first to launch products, occupy the market.
The above is a brief introduction to the application of high-precision air pressure sensor in GPS products. It is hoped that it can help solve the problem of GPS accurate navigation on overpasses and elevated roads, and expand the use of GPS receivers to enhance products. Added value to help companies expand domestic and international markets, rather than relying on low prices to participate in international competition.
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